/*
 * Copyright 2009 Jamie Gennis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.code.gwt.remoteaction.server;

import com.google.code.gwt.remoteaction.client.Action;
import java.lang.annotation.Annotation;

/**
 * An implementation of the ActionHandler annotation interface that can be
 * compared with the compiler-generated implementation.
 *
 * @author jgennis
 */
@SuppressWarnings("intfAnnotation")
class ActionHandlerImpl implements ActionHandler {

  protected final Class<? extends Action> value;

  public ActionHandlerImpl(Class<? extends Action> value) {
    if (value == null)
      throw new IllegalArgumentException("The 'value' argument may not be null");
    this.value = value;
  }

  @Override
  public boolean equals(Object obj) {
    if (!(obj instanceof ActionHandler))
      return false;
    final ActionHandler other = (ActionHandler) obj;
    return value.equals(other.value());
  }

  @Override
  public int hashCode() {
    return (127 * "value".hashCode()) ^ value.hashCode();
  }

  public Class<? extends Action> value() {
    return value;
  }

  public Class<? extends Annotation> annotationType() {
    return ActionHandler.class;
  }

  @Override
  public String toString() {
    return ActionHandler.class.getCanonicalName() + "(" + value.getCanonicalName() + ")";
  }
}
